Granite Pebble
Intrusive Igneous Rock
igneous
Category
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Shale
Fissile mudstone (Shale)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Vesicular Basalt River Rock
Vesicular Basalt
igneous
Basalt River Stone
Basalt
igneous
Granite and Mixed Landscape Gravel
Plutonic Igneous Rock / Weathered Alluvium
igneous
Quartz Pebble (Beach Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Iron-stained Quartzite
Metamorphic Quartz (SiO2) with limonite/hematite staining
metamorphic
Sandstone
Arenite (predominantly Quartz Sandstone)
sedimentary
Sandstone (likely Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite
Phaneritic intrusive igneous rock
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite
Phaneritic intrusive igneous rock
igneous
Sandstone
Arenite
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert / Flint Nodule
Cryptocrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Terrigenous Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Tumbled agate (likely Botswana or fortification agate)
Microcrystalline quartz, SiO₂ (chalcedony with banded impurities)
mineral
Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Red Sandstone Pebble
SiO2 with Fe2O3 (Quartz sandstone with hematite coating)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Shale
Lutaceous Sedimentary Rock
sedimentary
Druzy Chalcedony (Agate Geode)
Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz
mineral
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral
Sandstone (likely Arkosic or Quartzose)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Weathered Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Sandstone
Arenite/Quartz Arenite
sedimentary
Granite (weathered pebble)
Granite (plutonic igneous rock)
Igneous
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Sandstone (with potential Quartzite characteristics)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Likely pale limestone or calcite-rich rock
Calcite-bearing limestone; chiefly calcium carbonate (CaCO₃)
sedimentary
Sandstone (Iron-stained Pebble)
Sandstone (Quartz/Hematite dominated)
sedimentary
Granite
Phaneritic intrusive felsic igneous rock
igneous
Banded Ironstone / Jasper Siltstone
Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))
sedimentary